Police say vandals attacked aÂ Jewish cemetery in Northeast Philadelphia this weekend, just a week after a similar incident was reported at a Jewish burial ground in suburban St. Louis.

According toÂ Jim McReynolds, a detective for the Philadelphia Police Department, at least 75 to 100 headstones at Mount Carmel Cemetery were discovered knocked over Sunday morning. Several of the headstones were broken. Police areÂ investigating the incident as a case of vandalism.

âItâs pretty much intentional,â McReynolds told The Washington Post. âWe just have to find out if itâs drunken kids or an act of â well,Â it is a predominantly Jewish cemetery, so weÂ have to look into that fact.â

In a statement released Sunday evening, the police department said that it appears the headstones were knocked over sometime after dark on Saturday.Â Police donât have surveillance footage of the attack or any leads as to who might have committed it.Â The Anti-Defamation League is offering a reward of $10,000 for information leading to the arrest of the perpetrators.

Aaron Mallin of northern New Jersey toldÂ local news channel ABC6Â that he went to Mount Carmel to visit his fatherâs grave Sunday morning and discovered the damage.

âItâs just very disheartening that such a thing would take place,â Mallin said.

It is not clear whether the attack was motivated by anti-Semitism. McReynolds said there have been no such reports of vandalism at Jewish cemeteries in the region, though 33 tombstones were found toppled earlier this month at Holy Redeemer Cemetery, a Catholic burial ground about two miles from Mount Carmel.

In January, someone threw rocks through eight windows at a Philadelphia synagogue, Temple Menorah Keneseth Chai, before services were about to start. A window at the temple also wasÂ broken in December. At the time, police said that the incidents were connected but that they did not consider them a hate crime, according to ABC6.

The vandalism at Mount CarmelÂ comes after a similar attack atÂ Chesed Shel Emeth Cemetery in University City, Mo., where as many as 200 headstones were toppled. That incident, along with bomb threats against dozens of Jewish community centers across the country, sparked anxiety among many U.S. Jews.

âAttacking a cemetery, especially one that is all-Jewish, all-Catholic, or whatever it is, is basically an attack on the culture, the identity of the people that cemetery represents,â Aaron Breitbart, a researcher at the Simon Wiesenthal Center in Los Angeles,Â told The PostÂ after the St. Louis incident.

On Tuesday, after facing pressure to condemn the vandalism in St. Louis, President Trump calledÂ anti-Semitism âhorribleâ and vowed to take steps to counter extremism.

Two Muslim American activistsÂ started a fundraiser to help pay for repairs at Chesed Shel Emeth Cemetery. More than $130,000 had been donatedÂ in less than a week. On Sunday afternoon, the organizers of the campaign posted an update saying theyÂ had contactedÂ Mount Carmel to offer funds from the campaign.

The incident in Philadelphia also brought a wave of condemnations online, including tweets from Rep. Robert A. Brady (D-Pa.), whoÂ represents Philadelphia; Emmanuel Nahshon, a spokesperson for theÂ Israeli Foreign Ministry; and the Anti-Defamation League.